feat: adapt for sub-api keys [ref Codeinwp/optimole-service#1136]

[abaicus]

All Submissions:

• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

• Changes to adapt this with the sub-api keys integration from the optimole dashboard here https://github.com/Codeinwp/optimole-service/pull/1300
• If a sub-api key is used, it automatically hides the site selector option under Cloud Library
• The banner toggle will not work either, as that option is restricted on the dashboard to the root API key.

Closes Codeinwp/optimole-service#1136.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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🎉 This PR is included in version 3.14.1 🎉

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